baker’s dozen
noun/ˌbeɪkəz ˈdʌzn/
/ˌbeɪkərz ˈdʌzn/
[singular] (old-fashioned)- a group of thirteen (= one more than a dozen, which is twelve)Word OriginThis phrase comes from bakers’ old custom of adding one extra loaf to an order of a dozen.
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baker’s dozen